Shoulder is d-shaped with center to flat 0.245-0.255 in.
A headless fastener not exceeding 12 inches (304.8 mm) in length, threaded externally on both ends with threads of the same nominal diameter. All or part of the unthreaded section has a cross-sectional diameter greater than the nominal stud size plus 0.020 inches (0.508 mm). It may be thread relieved. See also stud, locked in.
NSN 6110-01-642-0346
NSN 6320-01-439-5264
NSN 6105-01-081-9599
NSN 5999-01-444-2091
NSN 5975-01-196-7580
NSN 5985-01-282-8016
NSN 5950-00-666-1887
NSN 6620-01-317-7849
NSN 5910-00-125-7122
NSN 6685-01-388-4061
NSN 6650-01-361-9336
NSN 5930-01-165-2764